GetThemePartSize

// UXTHEME.dll
#include <windows.h>

HRESULT GetThemePartSize(
    HTHEME hTheme,
    HDC hdc,   // optional
    INT iPartId,
    INT iStateId,
    RECT* prc,   // optional
    THEMESIZE eSize,
    SIZE* psz
);

<DllImport("UXTHEME.dll", ExactSpelling:=True)>
Public Shared Function GetThemePartSize(
    hTheme As IntPtr,   ' HTHEME
    hdc As IntPtr,   ' HDC optional
    iPartId As Integer,   ' INT
    iStateId As Integer,   ' INT
    prc As IntPtr,   ' RECT* optional
    eSize As Integer,   ' THEMESIZE
    psz As IntPtr   ' SIZE* out
) As Integer
End Function

' hTheme : HTHEME
' hdc : HDC optional
' iPartId : INT
' iStateId : INT
' prc : RECT* optional
' eSize : THEMESIZE
' psz : SIZE* out
Declare PtrSafe Function GetThemePartSize Lib "uxtheme" ( _
    ByVal hTheme As LongPtr, _
    ByVal hdc As LongPtr, _
    ByVal iPartId As Long, _
    ByVal iStateId As Long, _
    ByVal prc As LongPtr, _
    ByVal eSize As Long, _
    ByVal psz As LongPtr) As Long
' VBA7前提(PtrSafe)。32bit Office では LongPtr→Long。Integer=16bit / Long=32bit / LongLong=64bit。

import ctypes
from ctypes import wintypes

GetThemePartSize = ctypes.windll.uxtheme.GetThemePartSize
GetThemePartSize.restype = ctypes.c_int
GetThemePartSize.argtypes = [
    ctypes.c_ssize_t,  # hTheme : HTHEME
    wintypes.HANDLE,  # hdc : HDC optional
    ctypes.c_int,  # iPartId : INT
    ctypes.c_int,  # iStateId : INT
    ctypes.c_void_p,  # prc : RECT* optional
    ctypes.c_int,  # eSize : THEMESIZE
    ctypes.c_void_p,  # psz : SIZE* out
]

require 'fiddle'
require 'fiddle/import'

lib = Fiddle.dlopen('UXTHEME.dll')
GetThemePartSize = Fiddle::Function.new(
  lib['GetThemePartSize'],
  [
    Fiddle::TYPE_INTPTR_T,  # hTheme : HTHEME
    Fiddle::TYPE_VOIDP,  # hdc : HDC optional
    Fiddle::TYPE_INT,  # iPartId : INT
    Fiddle::TYPE_INT,  # iStateId : INT
    Fiddle::TYPE_VOIDP,  # prc : RECT* optional
    Fiddle::TYPE_INT,  # eSize : THEMESIZE
    Fiddle::TYPE_VOIDP,  # psz : SIZE* out
  ],
  Fiddle::TYPE_INT)

#[link(name = "uxtheme")]
extern "system" {
    fn GetThemePartSize(
        hTheme: isize,  // HTHEME
        hdc: *mut core::ffi::c_void,  // HDC optional
        iPartId: i32,  // INT
        iStateId: i32,  // INT
        prc: *mut RECT,  // RECT* optional
        eSize: i32,  // THEMESIZE
        psz: *mut SIZE  // SIZE* out
    ) -> i32;
}
// crates: windows-sys provides ready-made bindings for this API.

$sig = @"
[DllImport("UXTHEME.dll")]
public static extern int GetThemePartSize(IntPtr hTheme, IntPtr hdc, int iPartId, int iStateId, IntPtr prc, int eSize, IntPtr psz);
"@
$api = Add-Type -MemberDefinition $sig -Name 'UXTHEME_GetThemePartSize' -Namespace Win32 -PassThru
# $api::GetThemePartSize(hTheme, hdc, iPartId, iStateId, prc, eSize, psz)

#uselib "UXTHEME.dll"
#func global GetThemePartSize "GetThemePartSize" sptr, sptr, sptr, sptr, sptr, sptr, sptr
; GetThemePartSize hTheme, hdc, iPartId, iStateId, varptr(prc), eSize, varptr(psz)   ; 戻り値は stat
; hTheme : HTHEME -> "sptr"
; hdc : HDC optional -> "sptr"
; iPartId : INT -> "sptr"
; iStateId : INT -> "sptr"
; prc : RECT* optional -> "sptr"
; eSize : THEMESIZE -> "sptr"
; psz : SIZE* out -> "sptr"
; ※HSP3.7は #func のため戻り値はシステム変数 stat に格納されます。

#uselib "UXTHEME.dll"
#cfunc global GetThemePartSize "GetThemePartSize" sptr, sptr, int, int, var, int, var
; res = GetThemePartSize(hTheme, hdc, iPartId, iStateId, prc, eSize, psz)
; hTheme : HTHEME -> "sptr"
; hdc : HDC optional -> "sptr"
; iPartId : INT -> "int"
; iStateId : INT -> "int"
; prc : RECT* optional -> "var"
; eSize : THEMESIZE -> "int"
; psz : SIZE* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

; HRESULT GetThemePartSize(HTHEME hTheme, HDC hdc, INT iPartId, INT iStateId, RECT* prc, THEMESIZE eSize, SIZE* psz)
#uselib "UXTHEME.dll"
#cfunc global GetThemePartSize "GetThemePartSize" intptr, intptr, int, int, var, int, var
; res = GetThemePartSize(hTheme, hdc, iPartId, iStateId, prc, eSize, psz)
; hTheme : HTHEME -> "intptr"
; hdc : HDC optional -> "intptr"
; iPartId : INT -> "int"
; iStateId : INT -> "int"
; prc : RECT* optional -> "var"
; eSize : THEMESIZE -> "int"
; psz : SIZE* out -> "var"
; ※出力/バッファ引数は var 方式(変数を直接渡す)。varptr 方式にも切替可。

import (
	"golang.org/x/sys/windows"
	"unsafe"
)

var (
	uxtheme = windows.NewLazySystemDLL("UXTHEME.dll")
	procGetThemePartSize = uxtheme.NewProc("GetThemePartSize")
)

// hTheme (HTHEME), hdc (HDC optional), iPartId (INT), iStateId (INT), prc (RECT* optional), eSize (THEMESIZE), psz (SIZE* out)
r1, _, err := procGetThemePartSize.Call(
	uintptr(hTheme),
	uintptr(hdc),
	uintptr(iPartId),
	uintptr(iStateId),
	uintptr(prc),
	uintptr(eSize),
	uintptr(psz),
)
_ = err  // syscall.Errno (valid when the call sets last-error)
_ = r1   // HRESULT

function GetThemePartSize(
  hTheme: NativeInt;   // HTHEME
  hdc: THandle;   // HDC optional
  iPartId: Integer;   // INT
  iStateId: Integer;   // INT
  prc: Pointer;   // RECT* optional
  eSize: Integer;   // THEMESIZE
  psz: Pointer   // SIZE* out
): Integer; stdcall;
  external 'UXTHEME.dll' name 'GetThemePartSize';

result := DllCall("UXTHEME\GetThemePartSize"
    , "Ptr", hTheme   ; HTHEME
    , "Ptr", hdc   ; HDC optional
    , "Int", iPartId   ; INT
    , "Int", iStateId   ; INT
    , "Ptr", prc   ; RECT* optional
    , "Int", eSize   ; THEMESIZE
    , "Ptr", psz   ; SIZE* out
    , "Int")   ; return: HRESULT

●GetThemePartSize(hTheme, hdc, iPartId, iStateId, prc, eSize, psz) = DLL("UXTHEME.dll", "int GetThemePartSize(int, void*, int, int, void*, int, void*)")
# 呼び出し: GetThemePartSize(hTheme, hdc, iPartId, iStateId, prc, eSize, psz)
# hTheme : HTHEME -> "int"
# hdc : HDC optional -> "void*"
# iPartId : INT -> "int"
# iStateId : INT -> "int"
# prc : RECT* optional -> "void*"
# eSize : THEMESIZE -> "int"
# psz : SIZE* out -> "void*"
# なでしこ1は32bit・ANSI(Shift_JIS)。文字列=char*(ANSI)、ポインタ/ハンドル=void*(4byte)。